Initialization by FE solution: operation
Starting by FE solution
It is possible to start a transient computation by using as initial state the result of a Magneto Static, an AC SteadyState Magnetic or a Transient Magnetic problem.
AC SteadyState  Transient Magnetic relevance / example
The AC SteadyState application permits the study of the steady state regime, but it has the following drawbacks:
 approximations in the taking into consideration of the magnetic saturation*
 no possibility to compute the harmonics in space and time
The Transient Magnetic application compensates for the limits quoted above, but it has the drawback of requiring a computation time that can be quite long. Then, the number of time steps is important.
Starting a Transient Magnetic application on the basis of the AC SteadyState solution permits to rapidly reach the steady state regime without being forced to solve all the time steps of the Transient Magnetic problem until the steady state regime is reached.
Transient Magnetic  Transient Magnetic relevance / example
As with an AC SteadyState application, the Transient Magnetic application permits to obtain the steady state regime more rapidly without the need for the user to make again the computation of the transient phases or those for startup (starting up of a synchronous machine with magnets, for instance).
It also permits to reach a certain specified point of the steady state regime – for example the passage at zero of the current of one of the phases of an electric alternator.
Finally, and mainly, it gives the possibility of an initialization by FE problem when the system comprises permanent magnets, which is not possible with an initialization by an AC SteadyState problem.
Operation
The operation principle is described in the table below in the case of an AC SteadyState – Transient Magnetic sequence.
Phase  Description 

1  Construction of the Flux project 1 (AC SteadyState application) 
2  Solving of the Flux project 1 (AC SteadyState application) 
3 
Export of the FE solution: Creation of an exchange file (format FTS): see this page for more information on the phase choice 
Phase  Description 

1 
Construction of the Flux project 2 (Transient Magnetic application) on the basis of the Flux project 1 (AC SteadyState application) CAUTION: During the construction of the
Transient Magnetic project, be careful to repeat the same phases defined
in the corresponding sources in the electrical circuit of the AC
SteadyState project.
In general, the projects (1 and 2) must be
strictly identical from different points of view:

2 
Choice of the initial conditions:

3  Solving of the Flux project 2 (Transient Magnetic application) 